*{
	margin:0;
	padding: 0;
	-webkit-tap-highlight-color:transparent;
	box-sizing: border-box;
	-webkit-box-sizing:border-box;

}
body{
	font-size: 14px;
	font-family: "黑体";
	color: #333;
	min-width: 320px;
	max-width: 640px;
	margin: 0 auto;
}
a{
	color: #333;
	text-decoration: none;
}
a:hover{
	text-decoration: none;
}
input{
	border: none;
	outline: none;
	-webkit-appearance:none;
}
ul,ol{
	list-style: none;
}
/*头部*/
.ys_boss{
	width: 100%;
	max-width: 640px;
	min-width: 320px;
	margin: 0 auto;
	background-color: rgb(238,238,238);


}
.header_box{
	width: 100%;
	background-color: black;
	height: 50px;
	box-shadow: 0px 1px 3px;
	z-index: 1000;
	display: flex;
	position: fixed;
	top: 0%;
	align-items: center;
	background-color: black;
	box-shadow: 0px 1px 3px ;
	min-width: 320px;
	max-width: 640px;

}
.header_box>div{
	color: white;
	font-size: 1.3rem;
	width: 15%;

}
.header_box>span{
	color: white;
	font-size: 1.3rem;
	width: 70%;
	font-weight: bold;
}
.header_box>a{
	color: rgb(37,191,175);
	font-size: 1.2rem;
}
.section_img1{
	width: 100%;
	height: 740px;
}

section{
	height: 700px;
}
.header_div1{
	max-width: 640px;
	min-width: 320px;
	height: 700px;
	width: 100%;
	background-color: rgba(0,0,0,0.4);
	position: absolute;
	top: 40px;	
}

.header_div1>.header_p{
	max-width: 640px;
	min-width: 320px;
	height: 50px;
	width: 50px;
	margin: 350px auto ;
}
.header_div1>.header_p>img{
	height: 100%;
	width: 100%;
}

.header_div2{
	max-width: 640px;
	min-width: 320px;
	color: white;
	margin:-300px auto;
	text-align: center;
	font-size: 1.2rem;
}
.header_div3{
	width: 80%;
	margin-left: 50px;
	font-size: 1.1rem;
}
.center_nav{
	display: flex;
	flex-direction: column;
	border-bottom: 1px solid #e0e0e0;
	background-color: white;

}
.center_nav>.center_nav1{
	display: flex;
	justify-content: space-around;
	margin-top:10px;
	margin-bottom: 10px;
}
.center_nav>.center_nav1>.center_nav_friends{
	margin: 0 auto;
	width: 40%;
}

.center_nav>.center_nav1>.center_nav_friends>div>p{
	color: rgb(60,148,139);
	font-size: 1.3rem;
}
.center_text1{
	width: 80%;
	height: 130px;
	margin: 0 auto;
	border:2px dashed silver;
	
}
.center_text1>a{
	font-size:3.2rem;
	width: 100%;
	height: 100%

}
.center_text2{
	text-align: center;
}
